To call someone a Roger Ebert is to say that they are a naive pompous asshat with no credibility. It is most often used to describe people who spout their opinion on subjects they know little to nothing about.

This slang term became increasingly popular when the Pulitzer prize winning film critic declared that "video games can never be art," all while stubbornly refusing to play any of the great games of the medium. He found it unnecessary to experience an art form before denouncing its entire artistic merit.

"You hate the book, but you just said you never read it - way to pull a Roger Ebert."

The greatest film critic. Although we can all disagree with some of his reviews, he remains the best.

The skies are always dark with airborne filth in this Los Angeles of the future. It usually rains. The infrastructure looks a lot like now, except older and more crowded, and with the addition of vast floating zeppelins, individual flying cars, and towering buildings of unimaginable size. When I first saw the film I was impressed by the giant billboards with moving, speaking faces on them, touting Coca-Cola and other products. Now I walk over to Millennium Park and see giant faces looming above me, smiling, winking, and periodically spitting (but not Coke). As for the flying cars, these have been a staple of sci-fi magazine covers for decades, but remain wildly impractical and dangerous, unless locked into a control grid. - Roger Ebert on Blade Runner